no you can bake then and pull then apart paint then reseal. tabby and west did then and one of them did a how to and the back one are easy. just pull and spray with niteshade paint http://www.fordfullsize.com/forum/showthread.php?t=1268
I'm not sure exactly when i'm doing it but i'm doing the tails first and then i might wait on the headlights but i'll be sure to post pics when i do